Usability is retention insurance for organizations and web designers alike. The goal is to provide a pleasant and functional environment for users, and by testing early and often, we can ensure that is being accomplished. By checking your site against the five quality components Nielsen describes in the article, used to gage and improve ease of use that come in handy during the design process.
Nielsen's article help designers identify early on the importance of usability and how it will improve the overall usability of the site going forward and when to work on usability, from field studies to testing competitors' designs.
Giorgio Brajnik describes usability testing as a life-cycle of web design, making it an essential part of the process - both for concept and longevity of the website.
(Automatic web usability evaluation: what needs to be done? Giorgio Brajnik, 2000 Proc. Human Factors and the Web, 6th Conference)
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